I'm new to this, but TTC

I've been TTC for 3 months now. AF was due in the 10th but still no sign, done a home pregnancy test, that was negative. eve says my fertile window starts today? I've had a white creamy discharge with no smell. Can I still be fertile if AF hasn't been? I last had a period on septmber 10th. Being feeling sick, pain in lower back, more tired than usual and easily irritated recently. Any help ladies?